i'm facing recurrent issue when Testing an API published in Developer portal using the Api explorer.
i following these steps for publishing the API:
1. i have a backend API available on a LAC SERVER (backend API url : https://lac.ness.com:8083/rest/default/banking/v1 )
2. i took the swagger file of this api and modified in it the point to my gateway tenant which is enrolled with the portal (this is the gw url : https://gw3.local.poc:8443/banking_api/3
3. i successfully published the API with the modified swagger file using API key for authentication and also in the api explorer
now, i can test the API using a client app (like postman) via the gw url and get response from the backend . however, when i test it using the API explorer of the portal i get the following error (see screenshot as well) :
Error: Unable to make request. This may be due to a network error or a Cross-Origin Resource Sharing request pre-flight failure.
any ideas how can i resolve it ?